Bell Tower and Drum Tower -located inside the walled city -near the centre -drum tower square in between Bell Tower -used to announce the opening and the closing of the city gates and to alert the population at times of danger -built in 1384 -classic example of Ming architecture -originally located at the centre of the old Tang imperial city but moved and rebuilt in 1582 at its present location -triple-eaved with dou-gong -two-storey wooden pavilion -on top of a square brick platform of 8.6 meters high, 35.5 meters in length -4 archways with length and height both 6 meters, originally are roads for cars to pass through its centre. Nowadays, cars pass through the road around the tower. -the area of the tower is 1377.4 m2 -the whole tower is 36 meters high Drum Tower -used to mark the hours of day and night -built in 1380 -a road goes through the tower under a vaulted archway of 6 meters high -the area of it is 1924 m2 -the tower is 33 meters high -the tower is on top of a retangular brick platform with the dimension 52.6 meters X 38 meters and the height 7.7 meters -it is triple-eaved with two-storey wooden pavilion